behaviour that is not sensible and is typical of people who are much younger (行为)不成熟的,不够老练的,幼稚的 emotional immaturity 情感不成熟
the state of not being fully developed or grown 未长成的;发育未全的 the immaturity of renal function in some infants 一些婴儿肾功能不全
opposite maturity